<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script>
    //多个变量的声明
    var v1, v2, v3 = 'hello', v4 = 42, v5;
    var v1,
            v2,
            v3 = 'hello,
    v4 = 42,
            v5;
</script>
</body>
</html>